Radeon HD 4550 256MB vs Radeon R7 250

Intro

Compare those specifications to the Radeon R7 250, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1150 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
Radeon R7 250		65 Watts
	Difference: 40 Watts (160%)

Memory Bandwidth

Theoretically, the Radeon R7 250 should perform much faster than the Radeon HD 4550 256MB in general. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 60800 (475%)

Texel Rate

The Radeon R7 250 will be much (approximately 400%) more effective at AF than the Radeon HD 4550 256MB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 19200 (400%)

Pixel Rate

The Radeon R7 250 should be a lot (about 233%) more effective at FSAA than the Radeon HD 4550 256MB, and also should be capable of handling higher resolutions better. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 5600 (233%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.